I could stare at this gif showing the geographical sorting of college-educated Americans all day:
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159
42
515
GIF
Replying to @imkahloon
The colors are pretty misleading since the US average went from 10.6% in 1970 (when the red color means <0.6%) to 31.5% in 2018 (when the red color means <21.5%).

Feb 7, 2020 · 9:54 PM UTC

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Replying to @davidbaron @imkahloon
Agree. It would be more useful to see the difference in percent (say: 30% fewer graduates than the national average) than in percentage points. That being said, I expect to see a somewhat similar, though less pronounced, shift over time towards greater concentration.
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Replying to @davidbaron @imkahloon
This.